Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50
The AirTAC Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø125mm bore and 125mm stroke, 1/4" air ports and a hard-anodized aluminium body. Its short compact envelope saves about 50% of the mounting length of an ISO 15552 profile cylinder.
- BoreØ125 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM16×2.0
- CushionFixed TPU bumper (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50
The ACEJ125X125-50 is a double acting ISO 21287 compact cylinder with a 125 mm bore and a 125 mm stroke that can be trimmed on site. An external stop screw shortens the extend stroke by up to 50 mm, giving a usable range of 75-125 mm without changing the order code. At 0.5 MPa it pushes with 6135.9 N and pulls with 5890.5 N, so this is the right class for heavy clamping, pressing and lifting fixtures.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which matters when a 125 mm bore must fit inside a press frame or weld fixture. In practice, plan for roughly 3680 N of real work at 0.5 MPa, and expect about 313 kg of vertical lift with a 2:1 margin. The hard-anodized aluminium body carries a 25 mm S45C hard-chrome rod, a female M16x2.0 rod thread and a 1/4" PT port, with a fixed TPU bumper at each end.
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50 Technical Specifications
| Model | Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø125 mm |
| Stroke | 125 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/4" |
| Rod thread | M16×2.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Fixed TPU bumper (both ends) |
| Max standard stroke | Up to 300 mm |
Specifications follow the official AirTAC ACE-series (ISO 21287) datasheet. Body: hard-anodized aluminium alloy; piston rod: S45C carbon steel with hard-chrome plating. Rod type: female thread (blank) or male thread (B). Thread options: PT (blank) / G. A built-in magnet is OPTIONAL — add the -S code to fit CMSE / DMSE position sensors.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5890 N |
| 0.7 MPa | 8590 N | 8247 N |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 125 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -50 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| S | Optional built-in magnet for CMSE / DMSE sensors (omit for no magnet). |
| B | Rod type: B = male thread; blank = female thread. |
ACE-family variants: ACE (double acting), ASE / ATE (single acting push / pull), ACED (double rod), ACEJ (adjustable stroke), TACE / TACED (non-rotating twin-guide yoke). Mounting accessories: FA / FB flange, LB foot, CA / CB clevis, CR, SDB pivot, FTC; plus I and Y knuckles. Thread PT (blank) / G.
Where the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50 Is Used
Heavy press-frame clamping
The 6135.9 N push at 0.5 MPa clamps steel weld fixtures, and the 50 mm window lets you trim the 125 mm stroke to the fixture depth without reordering.
Lift table actuation
With about 313 kg of vertical lift at a 2:1 margin, this bore raises loaded pallet or die carts inside a compact machine envelope.
Gate and door actuation
Steel mill and foundry gates need the 125 mm bore force class; the short ISO 21287 body fits where a full-length profile cylinder cannot.
Is the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50 the Right Cylinder?
Size down if your load is lighter: the 100 mm bore delivers 3927.0 N push at 0.5 MPa, while the 125 mm bore here gives 6135.9 N. If you need more, the next step is a larger bore class - confirm from datasheet. The stop screw only shortens the extend stroke; it is a mechanical end stop, not a mid-stroke lock, so the rod can still drift if air is lost. Order the -S code if you want the optional magnet for CMSE / DMSE switches; this model has no magnet fitted. FA flange and LB foot mountings bolt to the standard ISO 21287 face.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Short stroke fits the compact body
- ✓ Port/thread type (PT / G)
- ✓ Add -S if you need the magnet for sensors
- ✓ Rod type (female / male B) & mount (FA/LB/CA)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Compact body: keep the stroke short and avoid side load on the rod.
- check Do not dismantle the threaded front/back covers.
- check Keep speed within the rated range; the TPU bumper absorbs stroke-end energy.
- check Installation by qualified personnel per AirTAC docs.
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-50 FAQ
At 0.5 MPa it pushes 6135.9 N and pulls 5890.5 N. At 0.7 MPa the figures rise to 8590.3 N push and 8246.7 N pull. The theoretical maximum is 1251.4 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), and speed runs 30-500 mm/s on air filtered to 40 um.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so a 125 mm bore fits tight press and fixture frames. The -50 stop screw shortens the 125 mm extend stroke by up to 50 mm on site, giving 75-125 mm; a fixed TPU bumper decelerates at both ends. FA flange and LB foot mountings fit the standard face. For position sensing, order the optional -S magnet code - this model has no magnet, so CMSE / DMSE switches cannot be mounted unless -S is specified.
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Standard models are processed and dispatched in 3-5 business days.
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